Rotary pump



,lly 9, 1929. E. J. WENDELL ROTARY PUMP Filed Feb. ll, 1928 Patented July 9, T929.

UNITED STATES EVEBT J WEN DELL, OF WAYNE, PENNSYLVANIA.

ROTARY PUMP.

Application tiled February 11, 1928. Serial No. 253,660.

lThis invention relates to improvements in pumpsand the primary object of th invention is to provide a pump of the centrifugal type of goed efficiency and which by reason of its relative simplicity and cheapness of manufacture and tf is fact that it is self-priming is partici; .rly Well adapted for certain classes of work to which pumps of this type as made in accordance with prior practices'have been generally unadaptable.

In the attac-hed drawings:

Figure 1 is a transverse section through a pump made in accordance with my invention; l

Fig. 2 is a section on the line 2 2, Fig. 1, and

Fig. 3 is a section on the line 3 3, Fig. 1.

Vith reference to the drawings, my pump in a preferred embodiment comprises a casing 1 having therein bearings 2 and 3 for a shaft 4 which projects through the casing at one side and is adapted for connection with a suitable source of power. Attached to the shaft in the interior of the casing 1 is a rotor 5 including a plurality of vanes 6 which in width correspond closely to the width of the chamber which the rotor oecnpies. This chamber has sectors, indicated in Figs. 2 and 3 by the reference numerals 7 and 81rcspectively, of different radius, the sector 7 being of shorter radius than the sector 8. Preferably the vanes 6 are of such length as to closely fit at their outer edges the wall of the sector 7 while a space is afforded between the ends.of the vanes and the inner wall ofthe sector 8. This is clearly shown in Figs. 2 and 3.

The casing 1 comprises a suction port 9 ind a discharging port 10, these ports entering the side of the casing and communicating respectively with the sector 8 and the sector 7. The casing also comprises a bypass between the two sectors 7 and 8 which is designated in Fig. l by the reference numeral 11 and which extends from the outer part of the sector 8 to the inner part of the sector 7, and it will be noted that in a preferred embodiment and as illustrated, this bypass 1l enters the sector 7 at a point directly opposite the port 10. The sizes of the various ports -may be substantially as illustrated or may be varied in accordance with the char-l acter of the work for which the pump is to be employed. Upon the relative areas of the ports will obviously depend to some extent the pump without priming.

the capacity of the pump and the velocity of discharge.

The operation of the pump is as follows: The casing is initially primed by introduction of suiicient liquid to insure immersion of the outer ends of the vanes 6 in the.sector 8 which preferably constitutes the bottom of the pump, this sector thereby also constituting during the periods of inoperatlon a reservoir in which sufficient water is trapped to insure the further operation of Togthis end, the intake duct 12 may be arranged as illustrated. The rotor operating at a high rate of speed impels the wateroutwardly by centrifugal action in the sector v8 and drives the water through the bypass 11 and into the lower portion of the sector 7. The outward movement of the liquid in the, sector 8 and through the bypass 11 creates in this segment a partial Vacuum which causes a suction at the port 9 which is connected, as by the duct 12, With the iuid which it may be desired to pump, this iiuid thus being drawn from the source through the port 9 into the sector 8 as indicated. This fluid, as the vanes come .into the sector 7, is trapped between the vanes, and the liquid entering this space through the bypass 11 forces the trapped fluid 'through the port 10,to the discharge. By reason of the relative location of the ports in the sector 7, the liquid discharged from the bypass is projected directly towards the port 10 and functions as a piston in displacing the trapped fluid. It will be noted that the vanes of the rotor function as impellers in the sector 8 and, n the sector 7, as valves to separate the suction and pressure sides of' the pump chamber.

The pump is capable of eicient operation in moving both gases and liquids, and is valuable as a vacuum pump. Primarily, however, the invention provides a pump of this class of extremely simple construction which, 'after the initial int-reduction of liquid, as set forth, is completely self-priming. Obviously, the pump is s ub ect to considerable variation in detail wit out departure from the essential features of the invention.

I claim:

1. A pump comprising a casing having a rotor chamber including sectors ofdifferent radius, a rotor mounted in the chamber and4 having vanes which corres ond in length substantially to the radius o the shorter secof smaller radius.

tor, intake and discharge ports in the side of said casing adjacent the axis of the rotor and communicating respectively with sectors of larger and smaller radius, and a bypass extending from the outer or peripheral? por:l tion of the sector of greater radius to the inner portion of the other sector and entering the side of the latter at a point opposite the discharge port.

2. Appump comprising a casing having a main chamber includingvsectors of different radius defining respectively intake and lpressure areas, a rotor inthe chamber having vanes fitting the sector of smaller radius. and functioning to 'segregate said areas, ports at opposite sides of the sector of smallerradius and in a port' inthe side of the sector of larger radius and in the inner portion-thereof, and a second port in thelast-named sector in the outer or peripheral portion thereof and connected with one of the ports of the sector rising a casing having a 3. A pump com uding sectors of different main chamber inc the. inner portion thereof; A

peller; an impeller '-lmpeller to provide within the chamber radius, the sector of greater radius having an intake port adjacent the inner portion and a discharge port in the outer or peripheral portion, and the sector of smaller radius hav- `ing intake and discharge ports both located and discharge ports,and means for directing pump fiuid transversely through the impeller at a point adjacent the axis of the latter.

5. A centrifugalv puni comprising an imcham er shaped with the segregated suction and pressure areas, and means for directing the discharge from the suctionA area transversely through the pressure area at a point adjacent the axis of the impeller.

EVERT. J. WENDELL. 

